Which refrigerant is classified both as an HCFC and an HFC?

R-22 is classified as an HCFC (Hydrochlorofluorocarbon) refrigerant, which means it contains chlorine in its molecular structure. This classification places it in a category of compounds that are subject to restrictions due to their potential to damage the ozone layer. While R-22 is primarily known as an HCFC, it is sometimes mistakenly referenced in discussions surrounding HFCs (Hydrofluorocarbons) because it is often a topic of comparison in the transition to more environmentally friendly refrigerants.

It is important to note that while R-22 is commonly referred to in discussions about HFCs, it does not fit the strict definition of an HFC. This understanding helps clarify the regulatory landscape along with the shift from compounds that deplete the ozone layer toward those that are more environmentally benign.

R-123, R-134A, and R-12 do not meet both classifications. R-123 is entirely HCFC, R-134A is primarily classified as an HFC, and R-12 is a CFC (Chlorofluorocarbon), which is a completely different category. This highlights the unique position of R-22 within both classifications in regulatory discussions.